07:50
Finite Mathematics and Calculus with Applications
There are three convenience stores in Folsom. This week, store I sold 88 loaves of bread, 48 qt of milk, 16 jars of peanut butter, and 112 lb of cold cuts. Store II sold 105 loaves of bread, 72 qt of milk, 21 jars of peanut butter, and 147 lb of cold cuts. Store III sold 60 loaves of bread, 40 qt of milk, no peanut butter, and 50 lb of cold cuts.
a. Use a $4 \times 3$ matrix to express the sales information for the three stores.
b. During the following week, sales on these products at store I increased by 25$\%$ ; sales at store II increased by $1 / 3 ;$ and sales at store III increased by 10$\% .$ Write the sales matrix for that week.
c. Write a matrix that represents total sales over the two-week period.